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A shell within a shell

This last weekend I was visiting R in Wales again, which is a long way away, and she navigated our way to Red Wharf Bay on Ynys Môn. Although Red Wharf Bay does not appear to have a Red Wharf – which I can’t help but hear as “Red Dwarf”, which I have now told R she is old enough to watch – it is a very interesting place to watch the tide come in and out. Naturally, R did as any child would do, and began constructing earthworks in a futile attempt to hold back and channel the tide.

As she did so she discovered this rather excellent shell, or pair of shells, where one shell has grown inside, or on top of, another shell. Something I have never seen before. And now you can see it too: